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1 CEN WORKSHOP CWA November 2008 AGREEMENT ICS English version Submerged Membrane Bioreactor (MBR) Technology This CEN Workshop Agreement has been drafted and approved by a Workshop of representatives of interested parties, the constitution of which is indicated in the foreword of this Workshop Agreement. The formal process followed by the Workshop in the development of this Workshop Agreement has been endorsed by the National Members of CEN but neither the National Members of CEN nor the CEN Management Centre can be held accountable for the technical content of this CEN Workshop Agreement or possible conflicts with standards or legislation. This CEN Workshop Agreement can in no way be held as being an official standard developed by CEN and its Members. This CEN Workshop Agreement is publicly available as a reference document from the CEN Members National Standard Bodies. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.:CWA 15897:2008 E

2 Contents Page Foreword...4 Introduction Scope Normative references Terms and definitions General system - requirements Basic considerations Pre-treatment and internal sieving Characteristics of biological systems used in MBR plants General Mixed liquor suspended solids (MLSS) Hydraulic retention time (HRT (or detention time)) Sludge age (or sludge retention time (SRT)) Chemical phosphorus removal Aeration Membrane filtration system Mixed liquor recirculation Permeate extraction system Desired effluent quality Material characteristics General Porous membranes Configuration Flat Sheet Hollow fibre Design and operating parameters General Influent characteristics Fouling Transmembrane pressure Permeability Integrity Acceptance, commissioning and monitoring tests Information and Documentation Interchangeability Principle General Process flow diagram (PFD) Scope of supply Interchangeability aspects General Membrane type Layout Tank Draining and flushing Integrity check

3 Accessibility and maintainability Chemical cleaning Process control system (PLC) Annex A (normative) Information and documentation Annex B (informative) Example for clean water permeability test B.1 Abstract B.2 Materials and methods B.2.1 Measuring apparatus B.2.2 Measuring procedure Annex C (informative) Example for vacuum leak test C.1 Abstract C.2 Materials and methods C.2.1 Measuring apparatus C.2.2 Measuring procedure Annex D (informative) Example for pore diameter measurement D.1 Abstract D.2 Materials and methods D.2.1 Latex solution D.2.2 Measuring apparatus D.2.3 Measuring procedure Annex E (informative) Paper filtration measurement E.1 Objective E.2 Measuring method Annex F (informative) Impact of pore size distribution on membrane fouling Bibliography

4 Foreword This CWA 15897:2008 was prepared by the CEN Workshop 34 'Submerged' Membrane Bioreactor (MBR) technology. The production of this CWA (CEN Workshop Agreement) was formally accepted at the Workshop's kick-off meeting on 06 June 2007 in Berlin. This CWA is based on a research of the European Commission within the scope of its 6 th Program: AMEDEUS (accelerate membrane development for urban sewage purification). Framework As a result the attending interested parties of the MBR standardisation workshop on 24 November 2006 confirmed the standardisation potential and needs of the membrane technology in Europe and especially to develop guidelines or standards on interchangeable filtration modules from both sides of the market. End users have a focus on costs and guaranties. Most market players expect that interchangeable modules will increase the willingness of decision makers to invest in MBR technology. The final review/endorsement round for this CWA was successfully closed on 14 April The final text of this CWA was submitted to CEN for publication on 25 June This CEN Workshop Agreement is publicly available as a reference document from the National Members of CEN: AENOR, AFNOR, ASRO, BDS, BSI, CSNI, CYS, DIN, DS, ELOT, EVS, IBN, IPQ, IST, LVS, LST, MSA, MSZT, NEN, NSAI, ON, PKN, SEE, SIS, SIST, SFS, SN, SNV, SUTN and UNI. Comments or suggestions from the users of the CEN Workshop Agreement are welcome and should be addressed to the CEN Management Centre The following companies/institutions were actively involved in the establishment of this CWA: University of Kassel, Germany GE W&PT Canada-Zenon Membrane Solutions RWTH Aachen, IVT, Germany Waternet, the Netherlands Kubota Membrane Europe, United Kingdom Martin Systems AG, Germany Aquantis GmbH, Germany Toray Membrane Europe AG, Switzerland Degrémont, France Rotreat Abwasserreinigung GmbH & Co. KG, Austria For the Secretariat: DIN e.v., Germany 4

5 Introduction This document deals with custom designed MBR systems for more than 500 PT. It became clear that it is not possible to have interchangeable membrane modules without considering a complete system. So this led to the conclusion that this document deals with the entire membrane system rather than the membrane modules alone. It was realised that today s market is a growing one with fast developments in membrane technology. Standards might be too early and may hamper the technological development. So it was decided at this stage start a prestandardisation process, creating a basic document for submerged MBR technology by means of a CEN workshop agreement (CWA). Maybe in a few years time standards will be essential and probably even needed for further growth of the market. Regarding interchangeability of MBR systems this document especially focuses on separate membrane tanks as there is a tendency that large MBR systems (more than m3/d) are designed with separated membrane tanks. Although there are differences between hollow fibre and flat sheet membrane manufacturers designs, it is believed that there is no need for separate guidelines because these are focussed on membrane tanks. Furthermore it is clear that interchangeability between hollow fibre membrane systems is not so easy and the same is true for flat sheet membrane systems. Thus, producing two sets of guidelines would be of no real benefit to interchangeability. 5

6 1 Scope This guidance document defines terms commonly used in the field of membrane bioreactor technology. The document aims at submerged MBR systems for the treatment of municipal wastewater with MBR Separate Systems and MBR Integrated Systems. This document establishes general principles for MBR filtration systems interchangeability between different MBR filtration systems from different manufacturers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1085, Wastewater treatment Vocabulary EN , Wastewater treatment plants Part 1: General construction principles EN , Wastewater treatment plants Part 6: Activated sludge processes EN , Wastewater treatment plants Part 10: Safety principles EN , Wastewater treatment plants Part 11: General data required EN , Wastewater treatment plants Part 13: Chemical treatment - Treatment of wastewater by precipitation/flocculation 3 Terms and definitions For the purposes of this guidance document, the terms and definitions given in EN 1085 will apply. In addition, the following terms and definitions specific to membrane bioreactor systems will apply. NOTE some manufacturers may use different terms for their products, but nevertheless the following terms and definitions are used in this document. 3.1 backflush see backpulse see backwashing backflush backpulse short-term reversal of the flow direction through the membrane in intervals to remove the particles accumulated during the filtration process (covering layer), usually with permeate 6

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